Big, huge, red flag.
My rAH started gambling (online, lottery, lotto, football squares, etc., etc.) at about 3 months sober. I accidentally discovered it around it around the 9 month mark (didn't confront him, just observed after the discovery). When I saw that it had become his new addition I file for divorce right @ 1 year sober. That is where I am at today.
I am not going to spend the rest of my life hitched to an addict. Life is too short and I will not waste any more energy worrying what is going on. I honestly believe that he has not addressed his core issues but that is his problem now.
Please proceed with caution.